Braking device



May 29, 1928. Y

L. ZAMBONI BRAKING DEVICE Filed Jan. 18, 1927 INVENTOR. Lawrence ZambomPatented May 29, 1928.

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i Application flled ianuary 18,1957. sum no. mam.

My invention relates to a means for checking rotary motion and it hasespecial reference to a devicefor arresting the motion of bodies or themovement of vehicles. The objcctof the invention is toprovide' a simpleand effective 11163118 for checking the move ment of rotatable elementsand vehicles 1n.

one direction, while permitting the free movement thereof in theopposite direction, therebyenabling vehicles to move from a checkedposition on an upgrade without that loss of power which is vehiclebefore the movement thereof on the incline is started and after thebrakes have been released. v a

Other objects will appear from the subjoined specification, inconnection with the accompanying drawing which is illustrative of a formof embodiment of the invention and in which a Fig. 1 is a side elevationshowing my in vention.

Fig. 9

is a sectional elevation taken on line 2-2 Fig. 3.

Fig. 3 is atransverse section taken on line 3-3 Fig. 1, and

Fig. 4 is side View showing the operative position of the brakingdevice.

My invention consists of a rotatable shaft or axle, which may compriseparts of a motor or other vehicle, a stationary. element, and meansmanually or otherwise movable with respect to said shaft or axle andsaid stationary element whereby the rotation of said shaft or axle inone or the other direction may be restrained without interfering withthe free rotary motion of the shaft or axle in the opposite direction. y

In a more specific sense, and referring particularly to the form ofembodiment of the device illustrated, my invention comprises a rotatableelement 1, which may be a power driven ordriving shaft or an axle. Thisshaft 1 may be provided with an enlargement otherwise and although it islooked upon theshaft or axle 1, preferable to employ an enlargement ofthe nature stated to provide increased leverage, it will be apparentthat the restraining mechanism hereinafter described may be applieddirectly to the enlargement 2 of the shaft or axle 1. Surrounding theshaftor axle 1 is a stationary element, preferably in the form ofaconcenrequired to hold the which may be a drum 2 keyed or trie ringBpprovided on the inner circumference thereof, with spaced arcuate 4,which are eccentric to the shaft or axle 1 and hence, in associationwith'the shaft 1 ortthe drum 2 thereof, present "convergent endqTheringg is preferably of steel and is arranged to: insetinahonsing 5,which may. be of cast iron and to be secured against rotation therein byany desirable means, as setserews6.:, U

Bymcans of a plurality of pins, rollers for other suitable members 7,which are disposed 1n the recesses provided in said ring 3, the rotationof the shaft or axis 1 in one direction may be restrained, while thefree movement thereof in the opposite direction may take place. Thesepins or members 7 extend through the arcuate recesses 41 in said ring 3and the respective ends thereof are journaled in an operatingdev1ce,wh1ch in this instance is shown as comprising plates .8 disposedon therespective sides of the housing 5 and provided with holes 9 throuh which the shaft or axle 1 is extended. 6n the inside, each of saidplates is formed with an annular groove 10 arranged to fit upon anannular extension 11 provided on each side of said ring 3 and forminbearings upon which said plates 8 are operable. The shaft or axle 1therefore rotates free of said plates 8.

'Iheplates 8 are providedon the inside with recesses 15, Fig. 2, for theaccommodation of the respective ends of a plurality of housing 5, andthey are in a radial linewith the pins 7, and in addition to spacing the8, they function to limit the moveplates ment thereof. An operatinglever 16 may be provided for, operating said plates 8.

The housing 5 beforereferredto is arranged to be secured in rigidposition to a convenient part of a vehicle or to a suitable frame, wherethe device is used in a connection other than with a vehicle, and forthis purpose may be provided with flanges 17 for holding or clamping thehousing.

In the position of the parts illustratedin Fig. 2, the pins 7 arecentral of the arcuate recesses 4 and the shaft, axle or other part1,may rotate freely. When, however, the pins '7 are moved by saidoperating lever 16 to one side or the other of the arcuate recesses 4and to such a degree that there is an engagement of them concurrentlywith the periphery of the rotating'part and the'convergent ends of thearcuate recesses, as shown in Fig. 4, the rotation of the shaft or axleis checked, in one direction, but the free movement of the shaft or axlein the opposite direction is not interfered with so long as no pressureis applied to the lever 16 to hold the rollers 7 wedged between theparts 2 and 3. The wedging action of the rollers 7 is practicallyautomatic after they have been moved to engagement with the parts 2 and3 by the lever.

The rotation of the shaft or axle 1. in a di-T rection away from theconvergent-ends of the arcuate recesses automatically moves the rollersfromtheirwedging position and also moves'the lever 16 when notrestrained and hence the shaft 1 may turn freely in one di-i rection,while the movement thereof in another direction is restrained by the wed'ng of the rollers between the parts 2 an 3. Thus a vehicle or a trainof vehicles may be restrained against movement in one direction whileall the motive power maybe employed without loss to Propel the vehicleor tram. lie is especially desirable on grades.

What I claim, is:

A device for checking the rotation of a rotary element comprising incombination with such element, a stationary housin having an openingthrough which said e ement is arranged to extend and provided withrecesses, rolling means in and co-operating with said recesses androtary element to check the forward or backward rotation thereof,saidzhousing rovided with bearings, and means opera and mounting saidrolling means to move same within said recesses.

le on said bearings In testimony whereof I have set my hand.

LAWRENCE ZAMBONI.

